To readout the spin state, we exploit a spin-to-charge conversion based on energy-selective tunneling [1]}.
For this purpose, at finite magnetic field, we first load QD with a single electron and then pulse the chemical potential where only the highest spin state can tunnel out of the dot.
Therefore, when the electron is in a up spin state, we observe a signal click, characteristic of the tunneling out of a up spin electron, followed by the tunnelling in of a down spin electron, depicted in Fig. REF (c) (blue curve). On the opposite, for a spin down, the signal is constant.
It is important to note that similarly to Ref [1]}, in both devices, the loading and unloading of QD is achieved through the CS and not through the reservoir.
This single shot detection of the spin state is further analysed by setting the detection threshold at the point of maximum visibility.
To find this point, we build the histogram presented in Fig. REF (d) where we bin the maximum of each measurement trace which lasts for \(1~{}\)  with a sampling rate at \(50~{}\) . The visibility is obtained by using the same method as in reference [1]}, which consists in simulating single shot traces using the extracted tunneling in and out times (respectively \(250~{}\)  and \(411~{}\) ) to describe the current distribution.
We obtain an average readout fidelity above 92% (and 86% visibility) limited by the tunneling in and out rates of the single electron [4]}.
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